.el-icon-my-theme {
    background: url("./theme.png") center no-repeat;
    background-size: contain;
    font-size: 16px;
}

.el-icon-my-theme::before {
    content: "\e7b3";
    visibility: hidden;
}

.el-submenu [class^=el-icon-] {
    font-size: 16px !important;
}